DIO58056/B/C/D

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DIO58056/B/C/D• Rev.1.8

The conditions that cause the DIO58056/B/C/D to reduce charge current through thermal feed-back can be

approximated by considering the power dissipated in the IC. Nearly all of this power dissipation is generated by

the internal MOSFET. This is calculated to be approximately:

BAT

BAT

CC

D

I

V

V

P

*

)

(





It is important to remember that DIO58056/B/C/D applications do not be designed for worst-case thermal

conditions since the IC will automatically reduce power dissipation when the junction temperature reaches

approximately 160°C (Constant temperature mode).

VIN bypass capacitor

Many types of capacitors can be used for input bypass, however, caution must be exercised when using

multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of

ceramic capacitors, a 10 µF ceramic capacitor is recommended for this bypass capacitor. Due to a high voltage

transient will be generated under some start-up conditions, such as connecting the charger input to a live

power source.

Charge current soft-start

The DIO58056/B/C/D includes a soft-start circuit to minimize the inrush current at the start of a charge cycle.

When a charge cycle is initiated, the charge current ramps from zero to the full-scale current over a period of

approximately 100 µs. This has the effect of minimizing the transient current load on the power supply during

start-up.